Hamstring Complex

Question 1

Biceps Femoris - Long Head

Answer 1

Origin - Ischial tuberosity of the pelvis, part of the sacrotuberous ligament

Insertion - head of the fibula

Isolated Function -

• • Concentrically accelerates knee flexion and hip extension
• • Tibial external rotation

Integrated Function -

• • Eccentrically decelerates knee extension
• • Eccentrically decelerates hip flexion
• • Eccentrically decelerates tibial internal rotation at mid-stance of the gait cycle
• • Isometrically stabilizes the lumbo-pelvic-hip complex and knee

Question 2

Biceps Femoris - Short Head

Answer 2

Origin - Lower 1/3 of the posterior aspect of the femur

Insertion - head of the fibula

Isolated Function - Concentrically accelerates knee flexion and tibial external rotation.

Integrated Function -

• • Eccentrically decelerates knee extension
• • Eccentrically decelerates tibial internal rotation
• • Isomentrically stabilizes the knee

Question 3

Semimembranous

Answer 3

Origin - Ischial tuberosity of the pelvis

Insertion - Posterior aspect of the medial tibial condyle of the tibia

Isolated Function - Concentrically accelerates knee flexion, hip extension, and tibial internal rotation.

Integrated Function -

• • Eccentrically decelerates knee extension
• • Eccentrically decelerates hip flexion
• • Eccentrically decelerates tibial external rotation
• • Isometrically stabilizes the lumbo-pelvic-hip complex and knee

Question 4

Semitendinosus

Answer 4

Origin - Ischial tuberosity of the pelvis and part of the sacrotuberous ligament

Insertion - Proximal aspect of the medial tibial condyle of the tibia (pes anserine)

Isolated Function - Concentrically accelerates knee flexion, hip extension, and tibial internal rotation

Integrated Function -

• • Eccentrically decelerates knee extension
• • Eccentrically decelerates hip flexion
• • Eccentrically decelerates tibial external rotation
• • Isometrically stabilizes the lumbo-pelvic-hip complex and knee